Excluding a removed drive from backup error report?

Since I removed a failed data disk (Drive G:/) from my Win7 64 bit system, Backup finishes but gives an incomplete backup error of not finding Drive G. When I search Change Backup Settings, I can find no reference to the missing drive, although the desired C: and D: drives are listed. How can I prevent this error reporting, ie, remove this drive from the backup list of sources?